<!DOCTYPE html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  
 </head>
 <body>
  <script>
var arr = [1,3,5];
var arr1 = [2,4,6];
var arr2 = [7,8,9]
var newArr = arr.concat(arr1,arr2);    	//合并3个数组
document.write(newArr);                 	//输出

  </script>
 </body>
</html>
